Apple's new smart speakers can discolour wooden surfaces, leaving a white mark where they are placed, the firm has acknowledged. From a report: The US company has suggested that owners may have to re-oil furniture if the HomePod is moved. The device went on sale last week after having been delayed from its original 2017 release date. Apple told Pocket-lint that it was "not unusual" for speakers with silicone bases to leave a "mild mark." But the gadget review site told the BBC it had never seen anything like this problem. The website's founder, Stuart Miles, told the BBC that a speaker left a mark on his kitchen worktop within 20 minutes.